CAJ | 학술논문

鉴于声品质客观评价中，噪声粗糙度算法尚未标准化，本文中提出了改进的 Aures 粗糙度算法(MARA)。选取最大转矩转速(3800r/min)为研究工况，进行了某汽油天然气双燃料发动机的声学性能台架试验。结果表明，燃用汽油时两个测点的声学响应均大于燃用天然气时的声学响应，整机辐射声功率级分别为106.2和103.7dB(A)。但人耳主观感觉却是燃用天然气时的噪声粗糙度比燃用汽油时大。采用MARA客观评价该发动机的噪声粗糙度的结果显示，燃用天然气时测点1和测点2的噪声总粗糙度分别比燃用汽油时大12.2%和4.3%，间接验证了MARA客观评价更接近于人耳主观感觉。
감우성품질객관평개중，조성조조도산법상미표준화，본문중제출료개진적 Aures 조조도산법(MARA)。선취최대전구전속(3800r/min)위연구공황，진행료모기유천연기쌍연료발동궤적성학성능태가시험。결과표명，연용기유시량개측점적성학향응균대우연용천연기시적성학향응，정궤복사성공솔급분별위106.2화103.7dB(A)。단인이주관감각각시연용천연기시적조성조조도비연용기유시대。채용MARA객관평개해발동궤적조성조조도적결과현시，연용천연기시측점1화측점2적조성총조조도분별비연용기유시대12.2%화4.3%，간접험증료MARA객관평개경접근우인이주관감각。
In view of that the noise roughness algorithm has not been standardized in sound quality objective evaluation, a modified Aures roughness algorithm ( MARA ) is proposed in this paper. An acoustic performance bench test on a gasoline/natural gas dual fuel engine is conducted at its maximum torque rotating speed of 3 800 r/min. The results indicate that the acoustic responses at two measuring points when fueling gasoline are higher than that when fueling natural gas, and the radiated sound power level of whole engine with different fuels are 106. 2db and 103. 7db respectively. But the subjective perception of human ears is just the opposite, i. e. the noise rough-ness of engine when fueling natural gas is higher than that when fueling gasoline. The results of objective evaluation for engine noise roughness with MARA algorithm show that the overall noise roughness of measuring point 1 and 2 when fueling natural gas are 12. 2% and 4. 3% higher than that when fueling gasoline respectively, indirectly vali-dating that MARA objective evaluation is closer to the subjective hearing sensation of human ears.